Mild and Efficient Deprotection of Acetal-Type Protecting Groups of Hydroxyl Functions by Triethylsilyl Triflate — 2,4,6-Collidine Combination
摘要:
Deprotection of acetal-type protecting groups of hydroxyl functions has been studied in detail. The treatment of alcohol derivatives protected by acetal-type protecting groups with TESOTf-2,4,6-collidine followed by H(2)O-treatment produces the corresponding hydroxyl compounds in good yields. The characteristic features of the method are very mild and chemoselective, and acid-labile functional groups can tolerate these conditions.
Treatment of tetrahydropyranyl (or tetrahydrofuranyl) ether of allylic alcohol with tributylmanganate provided 7-octene-1,5-diol (or 6-hepten-1,4-diol) in good yields. The reaction of propargylic tetrahydropyranyl ether with tributylmanganate is also described.
Iron-Catalyzed Direct Cross-Coupling of Ethers and Thioether with Alcohols for the Synthesis of Mixed Acetals
作者:Wei Han、Lu Cheng、Hongyuan Zhao
DOI:10.1055/s-0040-1707162
日期:2020.9
alcohols via α-C(sp3)–H activation of ethers and a thioether has been established that tolerates cyclic and acyclic ethers and alcohols containing aromatic N-heterocyclic moieties, providing an efficient and green method for the synthesis of mixed acetals with good to excellent yields. The robustness of this protocol is demonstrated by the late-stage oxidation of a structurally complex natural product
Photochemical C–H acetalization of O-heterocycles utilizing phenylglyoxylic acid as the photoinitiator
作者:Giorgos S. Koutoulogenis、Nikoleta Spiliopoulou、Christoforos G. Kokotos
DOI:10.1007/s43630-021-00126-7
日期:2022.5
easy-to-execute procedure for the C-H acetalization of O-heterocycles via visible light activation is presented, utilizing phenylglyoxylic acid as the photoinitiator. Biomass-derived O-heterocycles, like THF, can be employed, while primary, secondary alcohols and alcohols bearing a variety of functionalities were succesfully employed, affording the desired acetals in high yields. Facile acidic deprotection
A Convenient Synthesis of 2-Tetrahydrofuranyl Ethers
作者:Rachid Baati、Alain Valleix、Charles Mioskowski、D. K. Barma、J. R. Falck
DOI:10.1021/ol991332f
日期:2000.2.1
[GRAPHICS]A wide spectrum of alcohols and phenols are readily transformed to the corresponding 2-tetrahydrofuranyl ethers in good to excellent yields using CrCl2 and CCl4 in THF under nearly neutral conditions at room temperature.